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Q: Helium Balloons ( Answered,   1 Comment )
Subject: Helium Balloons
Category: Science > Instruments and Methods
Asked by: jockerboy-ga
List Price: $5.00
Posted: 24 Nov 2006 07:53 PST
Expires: 24 Dec 2006 07:53 PST
Question ID: 785242
How many 9 inch balloons are needed to lift a 600g piece of wood?

Clarification of Question by jockerboy-ga on 24 Nov 2006 07:53 PST
Subject: Re: Helium Balloons
Answered By: redhoss-ga on 24 Nov 2006 10:12 PST
Hello jockerboy, your answer is a simple application of the Archimedes
bouyancy principle. Here are a couple of good sources:

Using numbers from the first source you can expect 1.03 grams of lift
per liter of helium. Each of your 9 inch balloons has a volume of
6.255 liters. You should then get 6.44265 grams of lift from each
balloon. Therefore, it would take 94 balloons to lift 600 grams. This
is only an approximate number because these calculations were done at
STP (20 degrees C and 760 mm Mercury) and the weight of the balloons
themselves was neglected. If you can come up with an accurate weight
of your theoretical balloons, we could get a more exact answer.

I think that this should answer your question, but if there is
something I have neglected please ask for a clarification.

Subject: Re: Helium Balloons
From: markvmd-ga on 24 Nov 2006 20:19 PST
Nine-inch latex balloons weigh about a gram. Add a gram or two for any
attaching device(s) and you'll be pretty close to losing half your

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